Optical disk device controlling a revolution of a recordable optical disk according to a displacement between a phase of a sector synchronizing signal generated from a data-writing reference clock signal and a phase of a synchronizing signal obtained from address information

Abstract

An optical disk device that records and reproduces information on/from a recordable optical disk is provided. The optical disk device comprises a reference clock signal generating unit generating a data-writing reference clock signal used to obtain a data-writing timing upon recording data to the optical disk, a synchronizing signal generating unit generating a predetermined sector synchronizing signal from the data-writing reference clock signal, a data demodulating unit reading address information indicating a position on the optical disk from data recorded on the optical disk so as to demodulate the address information into a predetermined synchronizing signal, a displacement detecting unit detecting a displacement between a phase of the sector synchronizing signal and a phase of the synchronizing signal; and a data-writing control unit controlling a data-writing upon performing an additional recording to the optical disk by controlling a revolution of the optical disk dynamically according to the displacement.

What is claimed is:  
     
       1. An optical disk device recording information on a recordable optical disk including address information indicating a position of a part of the optical disk having not recorded any data yet, and reproducing information from the optical disk, the device comprising: 
       a reference clock signal generating unit generating a data-writing reference clock signal used to obtain a data-writing timing upon recording data to the optical disk;  
       a synchronizing signal generating unit generating a predetermined sector synchronizing signal from said data-writing reference clock signal;  
       a data demodulating unit reading address information indicating a position on the optical disk from data recorded on the optical disk so as to demodulate the address information into a predetermined synchronizing signal;  
       a displacement detecting unit detecting a displacement between a phase of said sector synchronizing signal and a phase of said synchronizing signal; and  
       a data-writing control unit controlling a data-writing upon performing an additional recording to the optical disk by controlling a revolution of the optical disk dynamically according to said displacement.  
     
     
       2. The optical disk device as claimed in  claim 1 , wherein said data-writing control unit increases a servo response dynamically to a motor revolving the optical disk, when said displacement surpasses a predetermined value. 
     
     
       3. The optical disk device as claimed in  claim 2 , wherein said data-writing control unit decreases said increased servo response back to a previous degree thereof, when said displacement becomes lower than a predetermined reference value. 
     
     
       4. The optical disk device as claimed in  claim 2 , wherein said data-writing control unit decreases said increased servo response back to a previous degree thereof, when a predetermined period has elapsed since said data-writing control unit increases said servo response. 
     
     
       5. The optical disk device as claimed in  claim 4 , wherein said data-writing control unit decreases said increased servo response back to the previous degree thereof, when a predetermined amount of data has been recorded to the optical disk since said data-writing control unit increases said servo response. 
     
     
       6. The optical disk device as claimed in  claim 1 , wherein said data-writing control unit increases a servo response dynamically to a motor revolving the optical disk, when said displacement surpasses the displacement detected last time by said displacement detecting unit. 
     
     
       7. The optical disk device as claimed in  claim 6 , wherein said data-writing control unit decreases said increased servo response back to a previous degree thereof, when said displacement becomes lower than a predetermined reference value. 
     
     
       8. The optical disk device as claimed in  claim 6 , wherein said data-writing control unit decreases said increased servo response back to a previous degree thereof, when a predetermined period has elapsed since said data-writing control unit increases said servo response. 
     
     
       9. The optical disk device as claimed in  claim 8 , wherein said data-writing control unit decreases said increased servo response back to the previous degree thereof, when a predetermined amount of data has been recorded to the optical disk since said data-writing control unit increases said servo response. 
     
     
       10. An optical disk device recording information on a recordable optical disk including address information indicating a position of a part of the optical disk having not recorded any data yet, and reproducing information from the optical disk, the device comprising: 
       a reference clock signal generating unit generating a data-writing reference clock signal used to obtain a data-writing timing upon recording data to the optical disk;  
       a synchronizing signal generating unit generating a predetermined sector synchronizing signal from said data-writing reference clock signal;  
       a data demodulating unit reading address information indicating a position on the optical disk from data recorded on the optical disk so as to demodulate the address information into a predetermined synchronizing signal;  
       a displacement detecting unit detecting a displacement between a phase of said sector synchronizing signal and a phase of said synchronizing signal; and  
       a data-writing control unit controlling a data-writing upon performing an additional recording to the optical disk by controlling a speed of writing data to the optical disk according to said displacement.  
     
     
       11. The optical disk device as claimed in  claim 10 , wherein said data-writing control unit causes said displacement detecting unit to perform the detecting again after decreasing said speed, when said displacement surpasses a predetermined value. 
     
     
       12. The optical disk device as claimed in  claim 11 , wherein said data-writing control unit starts the additional recording to the optical disk, when said displacement becomes lower than a predetermined reference value. 
     
     
       13. The optical disk device as claimed in  claim 10 , wherein said data-writing control unit causes said displacement detecting unit to perform the detecting again after decreasing said speed, when said displacement surpasses the displacement detected last time by said displacement detecting unit. 
     
     
       14. The optical disk device as claimed in  claim 13 , wherein said data-writing control unit starts the additional recording to the optical disk, when said displacement becomes lower than a predetermined reference value.